Abraham had many concubines and he had children with all of them. Whether he had children with them before and after Ishmael and Isaac were born is questionable. Nonetheless, he fathered many children.
However, in that ancient culture only legitimate sons are recorded.
When people talk stupidness, they should be careful to cover all their tracks.
Below is the story of Judah, Tamar and their two illegitimate sons. One of those ILLIGITIMATE sons, Phares is recorded by Matthew as Jesus' forefather.
At what point was Hager ever referred to as a prostitute? Yet this God of the Bible inspired its writers to record Judah's two sons which he got after screwing his daughter in law on the roadside who he thought was a prostitute. What is with these Biblical characters? Rueben was screwing his step mother on the rooftop.
But that God who sees and knows everything and doesn't make mistakes couldn't find another forefather for his son Jesus.
Tamar and Judah
After Shelah had grown up, Judah became a widower. After Judah mourned the death of his wife, he planned on going to Timnah to shear his sheep. Upon hearing this news, Tamar disguised herself as a prostitute and immediately went to Enaim which was en route to Judah's destination. Upon arriving at Enaim, Judah saw the woman but did not recognize her as Tamar because of the veil she wore over her face. Thinking she was a prostitute, he requested her services. Tamar's plan was to become pregnant by this ruse in order to bear a child in Judah's line, because Judah had not given her to his son Shelah. So she played the part of a prostitute and struck a deal with Judah for a goat with a security deposit of his staff, seal, and cord. When Judah was able to have a goat sent to Enaim, in order to collect his staff and seal, the woman was nowhere to be found and no one knew of any prostitute in Enaim. (Genesis 38:12–23)
Three months later, Tamar was accused of prostitution on account of her pregnancy. Upon hearing this news, Judah ordered that she be burned to death. Tamar sent the staff, seal, and cord to Judah with a message declaring that the owner of these items was the man who had made her pregnant. Upon recognizing his security deposit, Judah released Tamar from her sentence. Tamar's place in the family and Judah's posterity secured, she gives birth to twins, Perez and Zerah. Their birth is reminiscent of the birth of Rebekah's twin sons. The midwife marks Zerah's hand with a scarlet cord when it emerges from the womb first, but Perez is born first. Perez is identified in the Book of Ruth as the ancestor of King David. (Ruth 4:18–22) The Genesis narrative also makes a note that Judah did not have further sexual relations with Tamar. (Genesis 38:24–30)
Matthew 1King James Version (KJV)
1 The book of the generation of Jesus Christ, the son of David, the son of Abraham.
2 Abraham begat Isaac; and Isaac begat Jacob; and Jacob begat Judas and his brethren;
3 And Judas begat Phares and Zara of Thamar; and Phares begat Esrom; and Esrom begat Aram;
4 And Aram begat Aminadab; and Aminadab begat Naasson; and Naasson begat Salmon;
5 And Salmon begat Booz of Rachab; and Booz begat Obed of Ruth; and Obed begat Jesse;
6 And Jesse begat David the king; and David the king begat Solomon of her that had been the wife of Urias;
7 And Solomon begat Roboam; and Roboam begat Abia; and Abia begat Asa;
8 And Asa begat Josaphat; and Josaphat begat Joram; and Joram begat Ozias;
9 And Ozias begat Joatham; and Joatham begat Achaz; and Achaz begat Ezekias;
10 And Ezekias begat Manasses; and Manasses begat Amon; and Amon begat Josias;
11 And Josias begat Jechonias and his brethren, about the time they were carried away to Babylon:
12 And after they were brought to Babylon, Jechonias begat Salathiel; and Salathiel begat Zorobabel;
13 And Zorobabel begat Abiud; and Abiud begat Eliakim; and Eliakim begat Azor;
14 And Azor begat Sadoc; and Sadoc begat Achim; and Achim begat Eliud;
15 And Eliud begat Eleazar; and Eleazar begat Matthan; and Matthan begat Jacob;
16 And Jacob begat Joseph the husband of Mary, of whom was born Jesus, who is called Christ.